Owner’s Installation and Operation Manual Model AF700 Installation is to be performed by a qualified installer. SAVE THESE INSTRUCTIONS This unit is certified UL 391 U.S. ENVIRONMENTAL PROTECTION AGENCY Certified to comply with the 2016 particulate emission standards. Not approved for sale after May 15, 2020 This manual includes Installation and operation instructions for the Model AF700 Furnace utilizing the listed operational types: 1. Wood add-on 2.
Safety • Do not operate with fuel loading or ash removal doors open. • Do not connect this unit to a chimney flue serving another appliance. • Danger: Risk of fire or explosion. Do not burn garbage, gasoline, naphtha, motor oil, or other inappropriate materials. Do not use chemicals or fluids to start the fire. • Warning: Risk of fire. Do not operate with flue draft exceeding .060” water column/14.93 Pascals. Do not operate with fuel loading and ash removal doors open.
Specifications CONGRATULATIONS! You’ve purchased a heater from North America’s oldest manufacturer of wood burning products. By heating with wood you’re helping to CONSERVE ENERGY! Wood is our only Renewable Energy Resource. Please do your part to preserve our wood supply. Plant at least one tree each year. Future generations will thank you.
CAUTION: • The warm air supply outlet of the supplementary furnace shall not be connected to the cold-air return inlet of the central furnace because a possibility exists of components of the central furnace overheating and causing the central furnace to operate other than as intended. • Power source not controlled by furnace main disconnect. • Respect all local and national codes when installing this unit. • This unit is not to be connected to a chimney flue serving another appliance.
Furnace Installation INSTALLATION OPTIONS The installation of this furnace includes supplying electrical power, return (fresh air) ductwork, and supply air ductwork. This furnace may be installed in two different configurations. 1. Stand alone wood furnace 2. Add-on wood furnace See kit installation section in this manual to ensure proper assembly, installation and operation of your new furnace.
MAINTENANCE CLEARANCES Your furnace has recommended minimum maintenance clearance requirements. These clearances insure that there is adequate room to preform maintenance and service your furnace. DO NOT store fuel within the specified clearances. The clearances will change depending on what kits are installed with your furnace. See the tables and diagram below to determine the clearances for your furnace.
Duct Work Installation We strongly recommend that the hot air ductwork be installed by a home heating specialist. If doing the installation yourself, before you decide which installation will best suit your needs, consult a qualified heating technician and follow his recommendations as to the safest and most efficient method of installation. This furnace can be installed in three ways, as a stand alone unit, parallel, and in series with an existing furnace.
CENTRAL INSTALLATION ADD-ON INSTALLATION INSTALLATION A INSTALLATION B TO EXISTING DUCT WORK COLD AIR RETURN TO EXISTING DUCT WORK PLENUM COLLECTOR BOX WARM AIR WARM AIR COLD AIR RETURN EXISTING FURNACE FILTER BOX 8 SOLID FUEL FURNACE EXISTING FURNACE FILTER BOX SOLID FUEL FURNACE
INSTALLATION D INSTALLATION F INSTALLATION E INSTALLATION G 9
Accessory Installation ASSEMBLY OF FURNACE THERMODISC Your furnace requires the following items to be assembled or installed by the service person: Blowers and Blower Controls Electrical Connections 1. Remove all parts from inside the furnace and inspect for damage, including the firebrick as some breakage could occur during shipment. 2. Install the thermodisc on rear of furnace cabinet with the two screws provided. Mount the conduit assembly from the junction box to the thermostat bracket.
Chimney Installation CHIMNEY Your wood furnace may be hooked up with a factory built or masonry chimney, matching the diameter of the exhaust. If you are using a factory built chimney, it must comply with UL 103 or CSA-B365 standard; therefore it must be a Type HT (2100°F). It is extremely important that it be installed according to the manufacturer’s specifications. If you are using a masonry chimney, it is important that it be built in compliance with the specifications of the National Building Code.
MASONRY CHIMNEY Ensure that a masonry chimney meets the minimum standards of the National Fire Protection Association (NFPA) by having it inspected by a professional. Make sure there are no cracks, loose mortar or other signs of deterioration and blockage. Have the chimney cleaned before the furnace is installed and operated. When connecting the furnace through a combustible wall to a masonry chimney, special methods are needed as explained in the “Combustible Wall Chimney Connector Pass-Throughs” Section.
COMBUSTIBLE WALL CHIMNEY CONNECTOR PASS-THROUGHS Method A. 12” (304.8 mm) Clearance to Combustible Wall Member: Using a minimum thickness 3.5” (89 mm) brick and a 5/8” (15.9 mm) minimum wall thickness clay liner, construct a wall pass-through. The clay liner must conform to ASTM C315 (Standard Specification for Clay Fire Linings) or its equivalent. Keep a minimum of 12” (304.8 mm) of brick masonry between the clay liner and wall combustibles.
CHIMNEY CONNECTOR Your chimney connector and chimney must have the same diameter as the furnace outlet. If this is not the case, we recommend you contact your dealer in order to insure there will be no problem with the draft. The furnace pipe must be made of aluminized or cold roll steel with a minimum thickness of 0.021” or 0.53 mm. It is strictly forbidden to use galvanized steel. Your connector should be assembled in such a way that the male section (crimped end) of the pipe faces down.
Wood Heat Utilization The top down method of fire building is recommended for this appliance. After making sure that the stove air intake controls are fully open (completely pull-out towards you), Place the largest pieces of wood on the bottom, laid in parallel and close together. Smaller pieces are placed in a second layer, crossways to the first. A third layer of still smaller pieces is laid crossways to the second, this time with some spaces between.
Operation NOTICE: To minimize the risk of smoke spillage when opening the door with a fire in your furnace, crack the door open no more than 1” and wait for at least 10 seconds before opening it more to allow pressure stabilization inside the furnace. TESTING YOUR WOOD When the furnace is thoroughly warmed, place one piece of split wood (about five inches in diameter) parallel to the door on the bed of red embers. Keep the air control full open by pulling on it and close the door.
OPERATION Controlled combustion is the most efficient technique for wood heating because it enables you to select the type of combustion you want for each given situation. The wood will burn slowly if the wood furnace air intake control is adjusted to reduce the oxygen supply in the combustion chamber to a minimum. On the other hand, wood will burn quickly if the air control is adjusted to admit a larger quantity of oxygen in the combustion chamber.
CAUTIONS: • Ashes could contain hot embers even after two days without operating the furnace. • The ash pan can become very hot. Wear gloves to prevent injury. • Never burn the furnace with the ash trap open. This would result in over firing the furnace. Damage to the furnace and even house fire may result. TAMPER WARNING This wood heater has a manufacturer-set minimum low burn rate that must not be altered.
Maintenance Your wood furnace is a high efficiency furnace and therefore requires little maintenance. It is important to perform a visual inspection of the furnace every time it is emptied, in order to insure that no parts have been damaged, in which case repairs must be performed immediately. Inspect and clean the chimney and connector pipe periodically for creosote buildup or obstructions. GLASS • Inspect and clean the glass regularly in order to detect any cracks.
Replacement Parts Key Part Description 1 27312 2 891214 Stub Collar, 8” 2 3 27322 Top Panel 1 4 27329 Cabinet Back 1 5 26761 Hearth Plate 1 6 26765 Air Wash Plate 1 7 27325 Air Divider 2 8 88057 Ash Pan Door, Thermocord 1/2” 9 40627 Heat Exchange Door 10 892351 Exchange Handle 1 11 27327 Air Damper 1 12 26866 Door Latch 1 13 892503 Damper Handle 1 14 891987 Plastic Knob 2 15 610154 Ash Pan 1 2 Qty.
Replacement Parts 4 3 Key Part No. Description 5 6 7 Qty 1 891135 Handle, Spring (Lg-Nickel) 1 2 892347 Door Handle 1 3 40603 Cast Door 1 4 88082 Thermocord 3/4” 5 88087 Glass Gasket (1 X 1/8) 1 6 892346 Door Glass 1 7 26848 Window Clamp 1 8 26856 Door Cover Plate 1 2 1 50” 9 8 1 2 9 12 4 3 10 Key 11 5 8 6 7 Part No.
Service Record It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed. Service Provider: Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer’s instructions. Always use the manufacturer's specified spare part when replacement is necessary.
Limited Warranty Warm Air Furnace The operation of this heater in a manner inconsistent with the owner’s manual will void you warranty and is also against federal regulations. United States Stove Company warrants to the original purchaser its heating products against premature failure of any component due to workmanship, quality, or materials as follows: TIME PERIOD: Firebox .....................................................................................................................................
How to order Replacement Parts This manual will help you obtain efficient, dependable service from your stove, and enable you to order repair parts correctly. Keep this manual in a safe place for future reference. When writing, always give the full model number which is on the nameplate attached to the stove. When ordering repair parts, always give the following information as shown in this list: 1. The part number ________________________________ 2. The part description _____________________________ 3.
